halos after 0.25D change, repeatable and reversible - any ideas?

Discussion in 'Optometry Archives' started by Alan Robinson, Jul 22, 2003.

  1. I'm new to contact lenses and have a strange problem .........

    (I have done some digging in previous posts but none seems to answer this
    specifically).

    My trial (diagnostic) lenses were Frequency Excel monthly torics, and gave
    me vision as good as my specs except for the occasional blurring on blinking
    and the fact that my left eye lens was 0.25D too strong, making me ever so
    slightly short-sighted (I am long sighted with no correction). So, I was
    eager to try my 'real' lenses which were identical apart from a 0.25D change
    on the left lense sphere.

    The wierd thing is, with my 'real' lenses, bright point lights have coloured
    halos. This is true for bright lights 'in the dark' (i.e. when my pupil is
    large), but also the sun has the same effect - and I doubt my pupil is ever
    smaller than when noticing this effect (no I do not make a habit of staring
    at the sun). Reflections off cars in daylight can cause the effect too.

    The effect is completely repeatable and reversible - i.e. it goes away
    instantly if I put my trial lense back in, or switch to specs, and comes
    back instantly with my new lens.

    The effect seems more like a diffraction pattern than anything else to me,
    and I thought perhaps the lens was faulty, however, I have tried a
    replacement new lens, and the effect is still there. Now I'm confused. I'll
    have to go back to the opticians but wondered what you guys made of it.

    My optician assures me that my new lenses are the same brand as the trial
    pair even though they are packaged as an own-brand by the way.

    Alan
     
    Alan Robinson, Jul 22, 2003
    #1
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  2. Alan Robinson

    Mike Tyner Guest

    I've seen brand-new soft lenses with lathe marks that make diffracting rainbows
    in the microscope. Not all were Cooper lenses. Try one more lens from a
    different lot number.

    -MT
     
    Mike Tyner, Jul 22, 2003
    #2
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  3. How common are problems with new lenses?

    Ive been back to the opticians, who couldn't find anything wrong. They
    agreed to order me some new lenses (this time without my having to hand back
    the box I already have, so at least I can try one more from the same box).
    That will be my third 'real' lens after my two diagnostic lenses (first of
    which tore at the edge after a week). So ... two trial lenses = no halo, two
    'real lenses' from different boxes = halos. Only difference between trial
    and real is a 0.25D reduction in power.

    The only other suggestion the optician had was for me to try RGPs.

    If this goes on, I might want to change opticians .......especially if I can
    find one who stocks my lenses and doesn't have to order them. Anyone know if
    this is possible in the UK? Lenses are monthly torics, +2.50, -0.75 cyl, 170
    and +2.50, -1.25 cyl 180 with 8.7 base curve and 14.4 dia.
     
    Alan Robinson, Jul 23, 2003
    #3
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